Dehumidifier shows E5 and will not run the compressor; fan may still operate.

Critical safety warning: Refrigerant systems are pressurized and require EPA-certified handling. Do not cut or open sealed system lines yourself.

User-level checks:

• Ventilation: Ensure the dehumidifier has at least 12 inches of clearance around it and that intake and exhaust grilles are not blocked. Overheating can trigger protection.
• Filter and coils: Clean the air filter and gently vacuum dust from the condenser and evaporator coils to improve airflow.
• Ambient conditions: Very low room temperatures (below ~41°F / 5°C) can cause abnormal pressures; move the unit to a warmer room and retry.
• Power reset: Unplug for 10 minutes to allow internal overloads to cool and the control to reset.

Technician-level checks:

• Inspect the pressure switch/sensor wiring and connector on the main PCB.
• Test continuity of the pressure switch (if mechanical) or sensor output (if electronic) per Tosot service data.
• Evaluate compressor amp draw and line temperatures to determine if there is a sealed system issue.

If E5 persists after airflow and environment checks, contact a professional technician; sealed system or control board work is not DIY-friendly.